بررسي تاثير كود كمكي نيتروژن در تراكم و الگوي كاشت مختلف بر روي رشد و عملكرد دانه سويا

Effect of nitrogen fertilizer starter growth and grain yield of soybean, on plant density and planting pattern

Soybean plant uses nitrogen from symbiosis systems. Some field experiments indicated that application of amount of N reduce N defficiency in soybean plant. Effect of N probably influence plant density and planting pattern which effect on grain yield. The experiment was conducted as a split plot desgin in 4 replications for 2 years 1998 and 1999 in Dezful Agricultural Research Station. Main plots were 3 levels of N fertilizer as urea (N0 =without N application, N1= 50 kg/ha and N2=100 kg/ha). Nitrogen fertilizer was applicated in V3-V4 vegetative growth stages. Subplots were allocated to 2 plant density (D1=25 and D2=35 plant/m2) and planting pattern (P1=50 cm and P2=70 cm) in factorial. Combined analysis indicated that N starter fertilizer increased total dry matter and grain yield. High radiation interception in canopy was due to increased leaf area which influence biological matter and grain yield. Among yield compoents, seed number per m2 showed highest sensitivity to N fertilizer. Number of pod per m2 increased with high plant density. It seem to be high plant density with application of N fertilizer increase grain yield. The amount of solar radiation interception by crop canopy was increased with 50 cm interval between row planting. Effects of N fertilizer, high density with pattern of 50 cm was more efficient on growth and yield. Grain quality (protein) was relatively improved by (3. 23%) those treatments.